<!DOCTYPE html>
<html>
  <head>
    <title>css-animation-training</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" type="text/css" href="css/style.css" >
  </head>
  <body>
    <div id="range">
      <div id="ball">
        <span>球</span>
      </div>
    </div>
  </body>
</html>

